The general manager of Young’s last team, Buddy Nix, was so concerned that Young couldn’t handle even a backup job for the Buffalo Bills, he traded Monday for Tarvaris Jackson. Asked about Jackson’s prospects, Nix said, “Who knows? We’ll give it a try.”

Vince Young, replaced by a guy Buffalo is willing to take a flyer on.

Who could have imagined this coming six years ago, when Young trotted into a Rose Bowl end zone, the Longhorn Nation riding high on his broad shoulders?

The debate raged after that iconic moment as to whom Houston should take with the first pick, Young or Reggie Bush. My vote was VY. Charley Casserly, the Texans’ GM, went with the third-party candidate, Mario Williams.

Young seemed sure to make Casserly regret his decision, too, being named Offensive Rookie of the Year in 2006.

But as the years progressed in Tennessee, Young didn’t. He had problems off the field, as well.

Just last week, in fact, he was accused of reneging on a loan of $1.65 million at 20 percent interest. The terms reportedly jumped to 30 percent for missing a payment. Miss two, presumably, and you get a visit from a fellow who cracks his knuckles a lot.

Young was no better in Buffalo than he’d been as a backup in Philadelphia, his second strike. His last appearance with the Bills, he went 12-of-26 in an exhibition game Saturday for 103 yards and two interceptions.

You could certainly make the case he’s no worse than Tim Tebow, but it’s only a matter of time before that train jumps the track, too.